Undefeated boxing champion Floyd Mayweather has confirmed he will apply for a licence to fight Mixed Martial Arts, ramping up speculation the retired boxer will fight former UFC champion Conor McGregor.

Kieran Foran does not rule out 2018 Sydney return

His next NRL contract might be the least of his concerns but Kieran Foran has still stoked speculation about his future by refusing to rule out a return next year to Australia.

The priority for the Warriors' five-eighth is overcoming a hamstring complaint that had sabotaged his long-awaited NRL return last round.

The Warriors will sweat on his fitness ahead of Sunday's home clash with Gold Coast.

And the Auckland club will also hope they can retain Foran after he had hinted at a Sydney return in 2018 to be closer to his children.

"I want to get on the field for the Warriors and put my best foot forward for the club, which has given me an opportunity to turn things around and get my life back on track," Foran told reporters on Wednesday.